CVE-2026-39835
Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.
| Vendor | golang.org/x/crypto |
| Product | golang.org/x/crypto/ssh |
| Published | May 22, 2026 |
| Last Updated | Jul 24, 2026 |
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Affected Versions
golang.org/x/crypto / golang.org/x/crypto/ssh
0 < 0.52.0
References
go.dev: https://go.dev/issue/79563 groups.google.com: https://groups.google.com/g/golang-announce/c/a082jnz-LvI go.dev: https://go.dev/cl/781660 pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-5015 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-39835 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2480680 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41019 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36796 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36199 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37072 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:38504 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37410 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37123 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:43692 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26546 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36319 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26547 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36625 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36207 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36651 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40945 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40118 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36648 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41036 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37387 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:42146 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:43052 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:42796 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41066 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41031 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40262 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40972 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40974 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40969 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36797 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37271 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37268 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37272 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37286 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37296
Credits
NCC Group Cryptography Services, sponsored by Teleport